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  • Sir, I salute you. Commented Jul 25, 2012 at 21:18
  • A brief, but pedantic note: the "diagnostic port" is mostly there because governments have mandated them as part of an emission control scheme. Consequently, it has severe limitations; there are many things that could potentially be diagnosed with this port that are not (i.e. anything not having to do with emissions control). Commented Aug 28, 2012 at 23:22